Purified sulfonated organophosphorus compounds and catalysis of organic reactions therewith
AssigneeRhodia Fiber & Resin Intermediates
InventorsLarbi Aouni, Paolo Burattin, Pierre Coqueret, Marc Huser
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Abstract
Water-soluble sulfonated organophosphorus compounds are purified by at least partially removing contaminating sulfite values therefrom, by decreasing the pH of a solution of such sulfonated organophosphorus compounds to a value of less than or equal to 4, and maintaining the pH of the solution at this value of 4 or less for such period of time as to reduce the weight concentration of sulfite in the solution to less than 100 ppm; the organophosphorus compounds thus purified are well suited for the two-phase cocatalysis of a wide variety of organic reactions.
Claims11
A process for the purification of water-soluble sulfonated organophosphine compounds by at least partially removing contaminating sulfites therefrom, comprising decreasing the pH of a solution of said sulfonated organophosphine compounds to a value of less than or equal to 4, converting the sulfites into a sulfurous oxide gas and removing said gas from said solution, and maintaining the pH of said solution at this value of 4 or less for such period of time as to reduce the weight concentration of sulfite in said solution to less than 100 ppm.
Dependencies are inferred from the claim text.